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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51705f422258d3336a186de4180c27a8816552f3ae979d320dc0b35781e38273' 
  AND token = '4wB/sKHQwZeRI61+/6aZXwsbbGdw25YO1kIvC5hErgs=' 
  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"
    }
  }
}