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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97f51071e8b35578895b5f708c1a77724484de6d444b71958af801187574b3f' 
  AND token = '886XEvqK1wACqlKW5UGEf28nOmcbr1k+sKukfeZF2bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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