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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80c6d09af02fa3b2223998b932679279ff787048955e725ae0d42afe4950c6f' 
  AND token = 'UouSD9My3bnIdIiRkbhDm2/QVHjMeq4iIToWUVvq8WM=' 
  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"
    }
  }
}