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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fba8edad1305ccc1543a539e61e228cb009b03a1ad304e2484e7f0e7aa84a06' 
  AND token = 'r0BsFZlLbte+6CVtVwfnem1hK//qTs0BRswt3LSCGLI=' 
  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"
    }
  }
}