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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f868fadfd8c086bf3b7287729d9ca1b484f456b60cdbbb09dc4ff2af874abf2' 
  AND token = 'ZgHBPAJ1YacBYwQU3NECouXUAz0pGkh0b9HQcr4vta8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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