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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69526c09aa47bb9d43f3eb7a1243e75d5004f1b2ec27a5cb7ae45c63e27f1939' 
  AND token = 'G5NqU88LwH+fATHbfbHTIU4rcjrU/760MR51JQOn34s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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