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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7557ef3183727aca9b8e9d352a25f061c2a3296d27589b782e3bb1036b9e9298' 
  AND token = 'XN9zP0leIAxJ/dY8tH6UzpZdoonnOecn8QRlkCQoG3c=' 
  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"
    }
  }
}