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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c076dd27c6d72f6a61cd11347bdc1aecdd496543a7bfac24cc0da4a9529c3017' 
  AND token = 'exALx+B7QGyq1pRsuoHHwLfxEZ0YH6u7VmoJKvpu9gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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