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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64ca79ea102fd6f46845aca377ff6965de97601ee4f4bf2a60178d07e432a10' 
  AND token = 'MFX/laIulSShGr7k/S4XfXDMVNrddXxmswrqfftxPVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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