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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e2a190df35fb820cf8dbb71866d32525d86a23a8b6a4bde8d85e4916d786b8' 
  AND token = '6S/+BHitMRP+hkB0spdKTk6WEe7xixa03cbB4b9hNTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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