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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88eee1a266d649e1e99d6293ddd9745bc04a79208a1a4ba275b7d586ffd82ddb' 
  AND token = '6DDG8P5fHYnoWcekXyDDJCowJxl1am6xCKYB2xt0YWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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