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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3805fb6a74b27407c9ace0a087a943cde0151e41349736ff6fe9631324b3dad9' 
  AND token = '7+JjJvDAMpjaZOrrEM7Cqtqh0/vD2nWWDjF3jy6PIfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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