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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2019dd0e6f4afb7b4e89dfd5910b43073014c9711d4cfbdb837dad299fd19022' 
  AND token = 'Uda/s2LxR0ZkYuvzG0FgIo66K/nB/7H18ZyIF6IP0YY=' 
  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"
    }
  }
}