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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0627aa4c8fc33706d2d4960525b50c94ff8ace29d7780c387be3b7bdfea7d531' 
  AND token = 'Kt/C6Ch9A0n4C6GnteoqBOTS6wwMFP73ruvOA0lrTWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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