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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02679b4a7319709d091670aebab4ec11624178ff2298e34378daf60cf68cbd70' 
  AND token = '7pVtnHvusddZYDKeZoVqbRS2TTwZSJUVq69DXW/JIps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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