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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0c0fe96a8e6ba518006251925f3e06fe8d9c6f8c6b1b3889408e99d6d6ef22' 
  AND token = 'tektsKYZBQ6FK/oDMa9gBA1lrcWX2sN3uyWQ7wqDJUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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