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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc88cf1f2c8731b4dd9a9f25374a411c59869979f83f12dd044ca48a77eb9cc' 
  AND token = 'tmYDsUpt8igJ0KXOOnFaMciFiA8MI7U5b+0hwgfSuuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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