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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136600da2be922d42fb89d366d16f1601aad218205d117354977b62ff504e35e' 
  AND token = '58nJydCIGUrpS/M4wjeiUsHv/Q7W/oAqasYsv/hYxvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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