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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80bfd90835611620f4bb5aebbbf1ea03e2ab4bd002d144eabbf94e7e2c67ec9' 
  AND token = 'rUIa+jnTSUsNSaWi90acvzxn51Wc31aORRp9fKbY2V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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