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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2859d4b37c09e86f8e7ed5786e94e5d8b4fb6dba53ba8f72476e88f800fface' 
  AND token = 'X0lNkzN42cJCmr6VKY1Pjfe7NjXP7KElqlKZzwLxXS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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