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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdaa50038212318668ad9c05aa241ef0c46953cf76047418c1a4095b64c1f252' 
  AND token = '3LMngjCgGUB7Td50bDP9KAld5Ukq9i3d/JE5+pz0pK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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