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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fccc953d5b104e9bb2aa6eb868acf88522201300f0c1f5da34729ac93e31185' 
  AND token = 'NA1WoXdk8Wd0RZgquUShFkhCu/iDgqwsn9GuGmk9boY=' 
  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"
    }
  }
}