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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab886054f94c53afcd6ad3a87a568e8ee8c3170a29f57afd7cfaf0ce0f3f9bed' 
  AND token = '9rJj8JL8EED29E1uKAzw+QqJSayf4PfyS10UtBQc0ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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