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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ce00d52a452156415beb0ade068101b0523af719677425a57784997c95e5c6' 
  AND token = '5c+207ws1QeF8RGvnS/s2UpV5Nyp6KhhJM/uc30u6VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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