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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70b9fbd1dbd441415f68fea7d5acd70df71238bb0f56ae5774ff4d5d5973a39' 
  AND token = 'hRB5lzL6S0kKeBXb1hVu/zzn4cSETpRkn9c+v8LzI9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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