SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba6859c1092ff730d6dc3e088ac0560ff916e5b6494a77c03bde3391b518550' 
  AND token = 'PdpKRgOMlVLEetuL2gF9nxTbGoJrkwu3birzwBgSBvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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