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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71d8a286a9eaf90006ac71c42d78304b4e8cdb675be324209460a76753e94c8' 
  AND token = 'IG451YZmKOKygC/Q/hyHZSDiCEC1uULgB8uYXYM30CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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