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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25fa2d63322c54ec695f1f2aa807c8ee67735554a5adc5f0723b4b9927010bd' 
  AND token = 'lCjel7ppDR9de/rJXC3cOQnVHP4fDvaS8hILWh/w3K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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