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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0620c3a87a247f25ae2e94f6e10856dfee2c8ebf3b2fd39494f20f48151aaaf' 
  AND token = '5qZ6mK6LWUyR3i+kvfvReCIAWjV8WbBP9WcG5rMqdPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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