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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd850b8dc9a17a72d5eb29d7f8a9ae85cfce0a43eabb0422acffba0a5a39237e0' 
  AND token = 'l0KBKb8DH5A0NmTFJMVN3WusNKe/eBAx0XYCoHZ1UEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}