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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c3a47e9774e4ed4cc8db69ffecfec1a20a9edf46ad10c452155c8a356fb558' 
  AND token = '4RVbivu5/xYq05KCAnghuszp9+8140rxEGkpnw2OHnk=' 
  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"
    }
  }
}