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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19900864f90265565bcc53812ed236915e003ff34a2c8c9602d268b944b9c910' 
  AND token = 'M1Kia/8ICeEpMSp2KRgKdR5IhsxHCrSgm5T5/GlSN74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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