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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a52848c1520cd28a9a3364bd678c9f03fd9ebb43c12e40a91c34f26ba1462e0' 
  AND token = 'A2BFqfE+NVbszo+SYjk0fAkWM2RBP9WWb5T33YDK6XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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