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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f318fb833f964a999595c1d1406167ac8f9e52190dc17bc6a770ac7398e8800' 
  AND token = 'tYpHeHb/n5BQPQ21B5F8Ep/Hj8yADFDW1rq0LDVmUGM=' 
  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"
    }
  }
}