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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae7b0ae7339d5c6d69e709939cf27770d0c712ad6cfda6d8b0924f488c6d5f5' 
  AND token = 'iiT73PhgxbnMJM7fUcT2Za59bVVJ5A0OGTJvWsfu6r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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