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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195eb8e5df7cc4cdea6792ad9bd94db920c065bf53dde326c5629b2359af1cc0' 
  AND token = 'ugE60ltwHVhaMEWlLI18Ce5kzPu2OZ/WRFaKWh0lZp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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