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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fb9c4b61181e9ec75d5d9ef10ba9b910b14c0eef483a01a7ee67639ad773b5' 
  AND token = 'X4r1apOvf8C+UUEtq+mRprmfoei10R5CnzuFtwktdiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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