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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13b99866ccd06cbcaef3a66d8d6fd1f3b3fc5c0f76601fbae7d17ed13a64336' 
  AND token = 'dOy1UAR6KA6riIQgpGqvuGKwDZm48Knqz6nuIOW4QII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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